Cloud of Duality

You fill the area with clouds of radiant and necrotic energies in a sphere 10 feet across, centered on a point you choose within range. A creature takes 4d4 (radiant damage during the day, necrotic damage during the night) when it enters the spell’s area for the first time on a turn or starts its turn there. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 2d4 for each slot level above 2nd.